radix-ui
A Button inside a disabled fieldset will not correctly be visually shown as disabled
In an HTML form, a button element placed inside a fieldset with a disabled attribute will inherit that attribute and be disabled, without needing to explicitly also set disabled on the button itself.
Placing a radix-themes Button component inside a disabled fieldset correctly results in the button being disabled, but visually the Button will look as if it is still active. (The only correct styling aspect will be the mouse cursor which shows a disabled state.)
The problem here is that the visual "disabled" styling rules for the Button component are only associated with the data-disabled attribute.
Correct behaviour should be to style based on the :disabled pseudo-selector, so that when the button inherits being disabled from a parent element the style rule will still apply.
(The cursor behaviour works correctly because that styling rule uses the selector .rt-reset:where(:disabled, [data-disabled]))
